/Engine/Source/Developer/MeshUtilities/Public/MeshUtilities.h
void RecomputeTangentsAndNormalsForRawMesh ( bool bRecomputeTangents, bool bRecomputeNormals, const [FMeshBuildSettings](API\Runtime\Engine\Engine\FMeshBuildSettings) & InBuildSettings, [FRawMesh](API\Runtime\RawMesh\FRawMesh) & OutRawMesh ) const